Chemical burns to scalp from dyes or hair straighteners

Is there a way to check whether the hair loss is from chemical burns as opposed to a condition like alopecia?

If there is an event where a chemical burn could have happened, then the burn may limit some or all of the hair growth in the area where the burn happened. I generally say if hair has not grown in 8 months since the incident, then the chemical burn is permanent. Hair Transplants or Scalp Micropigmentation give solutions to this problem along with concealers like Toppik.